I am brand new to this, but have enjoyed my first week of shaving with a DE. Can anyone help me identify the construction and relative quality (or price point) of this e-shave brush? It was part of a kit that I received as a gift several years ago. It seems to do its job well, but I've got no frame of reference. Knot is ~20mm and loft is ~60mm. Thanks!

That looks like a (pure/black/grey) grade badger hair. It's pretty fair to say it is entry level and lower quality but affordable option available. If you are looking for any help on your next brush, regardless of what kind of hair, The Shave Nook members will be able to really help you out a lot. Keep using your brush and happy shaving!